Try 100x100... > -----Original Message----- > From: [email protected] [mailto:postgis-users- > [email protected]] On Behalf Of Rasmus Aveskogh > Sent: Wednesday, August 27, 2014 11:08 AM > To: PostGIS Users Discussion > Subject: Re: [postgis-users] Elevation profiles from rasters > > Thanks, > > I'm using the technique described at http://blog.mathieu- > leplatre.info/drape-lines-on-a-dem-with-postgis.html > > What would be small tiles in this context? 256x256? The raster I was testing > against was ~1200x1200. > > -ra > > On 27 Aug 2014, at 16:19, Pierre Racine <[email protected]> > wrote: > > > Elevation profile should be quite fast depending on how you tile > your raster coverage. Smaller tiles make computation faster. Index them > and make sure your query is actually using the index. > > Pierre > > > > -----Original Message----- > From: [email protected] > [mailto:postgis-users- > [email protected]] On Behalf Of Rasmus Aveskogh > Sent: Friday, August 22, 2014 4:10 PM > To: [email protected] > Subject: [postgis-users] Elevation profiles from rasters > > Hi! > > How hard/feasible would it be to implement elevation > profile/drape line > functionality in PostGIS? Since PostGIS already depends on > GDAL I assume > making use of the GDAL API would make this quite easy, > such as in the Zoo- > Project service: > > http://www.zoo-project.org/trac/browser/trunk/zoo- > project/zoo- > services/gdal/profile/service.c > > Providing functionality that could eventually be used for > applications like: > http://www.zoo- > project.org/site/ZooWebSite/Demo/GdalProfile (using the > code above) > > I'm currently using an ad-hoc PostGIS-function to pull out > elevation profiles > from my rasters, but it's quite slow and CPU intensive and > as such does not > make a good fit as a backend service for a web application > like the above. > > -ra > > > _______________________________________________ > postgis-users mailing list > [email protected] > http://lists.osgeo.org/cgi-bin/mailman/listinfo/postgis-users > >
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